消除警告:Conflicting return type in implementation of 'application:supportedInterfaceOrientationsForWindow:': 'UIInterfaceOrientationMask' (aka 'enum UIInterfaceOrientationMask') vs 'NSUInteger' (aka 'uns
文件中的锁定屏幕的方法:-(NSUInteger)application:(UIApplication*)applicationsupportedInterfaceOrientationsForWindow:(UIWindow